April Fool's Day, also known as Wan Yu, English as April Fool's Day. West is the United States folk festivals, festival in April 1 each year. April Fool's Day has occurred for hundreds of years, for its origin different opinions. One theory is that the practice originated in India, "Quan slang section." This section provides an annual festival on March 31 of this day, of all ages, you can make fun of each other, cheat each other fool in exchange for entertainment.